The Sevier County Sheriff’s Department is asking for the public’s help in locating a missing teenager. Fifteen-year-old Heidi Johnson was reported missing from Seymour High School in Sevier County. Deputies are describing her as an endangered runaway; she was reportedly last seen Friday afternoon (April 20) about 1:45 p.m., wearing a red shirt and jacket. Investigators say Heidi is a 5’4″ 140-pound white female with brown hair and blue eyes. Anyone with information about the girl’s whereabouts is asked to call Detective Tim Farmer at the Sevier County Sheriff’s Office: 865-453-4668 or 865-774-3931.